Use pi constants instead of numbers

parts/backgrounds/blockhole.lua

@@ -19,9 +19,9 @@ function back.update()
     t=t-1
     if t==0 then
         local S={
-            ang=6.2832*rnd(),
+            ang=MATH.tau*rnd(),
             d=SCR.rad*1.05/2,
-            rotate=6.2832*rnd(),
+            rotate=MATH.tau*rnd(),
             va=.05-rnd()*.1,
             size=SCR.rad*(2+rnd()*3)/100,
             texture=SKIN.lib[SETTING.skinSet][rnd(16)],

parts/backgrounds/blockrain.lua

@@ -21,7 +21,7 @@ function back.update()
             x=SCR.w*rnd(),
             y=SCR.h*-.05,
             k=SCR.rad/200,
-            ang=rnd()*6.2832,
+            ang=rnd()*MATH.tau,
             vy=.5+rnd()*.4,
             vx=rnd()*.4-.2,
             va=rnd()*.04-.02,

parts/backgrounds/blockspace.lua

@@ -21,8 +21,8 @@ function back.update()
         ins(mino,{
             block=TEXTURE.miniBlock[r],
             color=BLOCK_COLORS[SETTING.skin[r]],
-            ang=6.2832*rnd(),
-            rotate=6.2832*rnd(),
+            ang=MATH.tau*rnd(),
+            rotate=MATH.tau*rnd(),
             vr=.05-rnd()*.1,
             d=0,
             v=.5+rnd(),